When were two-digit phone numbers used?

Numbers earlier
(Guest - data unconfirmed)


Hello !

I am still interested in the principle after phone numbers were assigned in local networks until the mid-1990s, for example their arity:

I know, for example, that in a local network 0X932 at the beginning of the 80s, in addition to 3 even 5-digit numbers, which then began with "8". However, 4-digit numbers were assigned elsewhere until the 1990s. . .

In another local network I know that at the same time even 6 digits were assigned, which then led to ten digits, which was unusual for then.

What was the system like back then?

Like the laws?

Number of answers below: 37
Christoph Lauter
(Email address confirmed)

This text refers to the article by Wolfgang Rapp from March 18, 2014!


Thanks for the link. I just took a quick look. I have to say, I can't figure it out. So I can't find my parents' phone number (09621/159 **) anywhere. You've had that number at least as long as I've been alive (1980), and probably since 1974.

Otherwise, I personally find it practical not to always have to dial the whole number with the area code, which is common here in France, where I live now: Here there are always 10 digits, the first digit is always a 0, However, there is still a location reference through the second digit, which indicates the area in which one lives (the numbers can only be ported within this area).

Otherwise it is also very practical to know in advance how long a number is, which is really impossible to predict in Germany. In the US, France and Russia (recently) numbers always have 10 digits.


Wolfgang Rapp
(Email address confirmed)

This text refers to the contribution by Christoph Lauter from 03/18/2014!

Here is the link to the "database" - in principle these are CSV files that anyone can then prepare in Excel or Access.

http://www.bundesnetzagentur.de/DE/Sachgebiete/Telekommunikation/Unternehmen_Institutionen/Nummerierung/Ruf Numbers/ONVerzeichnisse/ONVerzeichnisse_Basepage.html

There are all allocated number blocks and the old stock prior to 1998.

Regarding the previous post, I would like to agree that I find it very practical to be able to reach my family, friends, etc. via the phone number without an area code.

Well, my cell phone usage is also tending towards 0, I almost only use landlines. And usually dial the numbers by hand, with the 611 there is no other way ...

It is known to be the opposite of many European countries, where the local network connection has completely disappeared, in the USA.

Telephony there is more location-based than in any other country. Even the cell phones get a phone number from the area in which they are registered.

You cannot recognize a cell phone number as easily as with us because it starts with 017x. It looks like a normal landline number.

Dietrich Arbenz
(Email address confirmed)

This text refers to the contribution by Thies Joachim Hoffmann from March 17th, 2014!


From my point of view, this statement is somewhat subjective and emotional. I would therefore like to make the discussion more objective.

When comparing the numbering of landline and cell phone networks, it must be taken into account that both are based on systems that have grown differently; the structure of the fixed network is completely different due to previous technological conditions. But: even if the numbering of the cell phone network were more advantageous from the user's point of view and therefore desirable for the fixed network, the conversion of the fixed network would require major changes (= investments) - and why should Telekom do that? What return on investment would that result?

I am also convinced that the majority of users prefer shorter phone numbers - and certainly not accept a fixed network switch to longer phone numbers without grumbling.
Who of the elderly does not remember the outcry earlier when the Federal Post Office forcibly introduced an additional number for all subscribers of a local network sub-area in the 80s when a local area network was expanded, whereby 79xxxx became 791xxxx, for example.

The current handling of Telekom (and meanwhile the regulatory authority) is actually the optimal compromise between customer interests and technological requirements:
- everyone can keep their phone number, whether short or long
- However, new customers always receive the longer number that is usual in the relevant local network.

Why have new customers always received this longer number for many years? Telephone numbers are a resource that, because they cannot be increased at will, should not be wasted. A 6-digit numbering wastes e.g. a maximum of 8-digit numbering a total of 99 numbers that can no longer be used (example:
Numbered 6 digits: 234567, but there is
8 digits: 23456700 to 23456799.

And one more clarification: from a technical point of view, the German telephone network has always allowed a phone number of any length, e.g. 13 digits (when 12 digits were still internationally standardized). But participants with such "overly long" numbers could not be reached by themselves from many countries (namely those with fixed numbering). At the time, this ultimately led to the Munich area code having to be changed from (0) 811 to (0) 89 so that large Munich companies with 5-digit extension numbers could also be dialed from abroad. This problem finally led to the standardization being shifted to 15 digits in the meantime.

Greetings Dietrich
Wolfgang Rapp
(Email address confirmed)

This text refers to the contribution by Thies Joachim Hoffmann from March 17th, 2014!

> After the market has opened
> the former RegTP still
> bothered for a few years
> made the "ten" /
> "Eleven digits" of the
> Numbers separately each
> Local network and partly still
> only for extension or for
> All at their disposal where it is
> Was required in detail.
> But that has a lot
> Administrative effort made

A few years is good, that's more than 10 years since the end of the DBP.

In July 2011, the 11-digit number (without 0) was decreed nationwide by the Federal Network Agency.

Before that, it was regulated differently in each local authority. In our (07031) - as I said - new assignments were still 6 digits until July 2011.

My phone number can be traced back to a Telekom contingent from 2001 using the phone number database (can be downloaded from the BNetzA).

Right. In 2001 I had my first own telephone connection at Telekom.

My parents' connection is still shown as "DBP old stock". Also true.

So here was really meticulously kept a record of the numbers and old records, each individual number can be assigned to the original provider who issued it to the RegTP / BNetzA.

Incidentally, the phone number is also returned to this original provider if a subscriber who has ported his phone number terminates or moves.

Thies Joachim Hoffmann
(Email address confirmed)

This text refers to the contribution by Endamt51 from March 17th, 2014!

> Length of the total number / meaning of this specification

In the beginning, this question was not about the maximum length you explained, but where the current (minimum) size for new numbers comes from:

After the market was opened, the former RegTP took the trouble for a few years to have the "ten" / "eleven digit" numbers separately for each local area network and sometimes only for direct dialing or for everyone, where it was necessary in detail. But that made a lot of administrative work. Until this realization (but easier to scrap everyone with the same brush of the highest denominator) matured, it has become fashionable in the meantime to want ten 1 & 1 numbers in addition to ten Telekom numbers of which you only use two, possibly plus SIP accounts, and that in private households. Therefore, one went straight to the "eleven" digit (for normal mortal end users who count the traffic elimination zero that makes the area code the area code the area code, twelve digits).

Unfortunately, the narrow-mindedness of German regulators stood in the way of the alternative of tapping the free potential of smaller local networks into a pool by omitting the local network boundaries. The otherwise more conservative Swiss is happy to be able to take his phone number with him when moving nationally, only the German allegedly does not want to give up his habit of being able to dial without an area code in urban areas.

In reality this is nonsense: there are now more cell phones than landline connections, from my home office (with a number from the company's ON) I have to call the neighbors with the area code anyway and many numbers are dialed from memories instead of by hand; In addition, local network boundaries often run through cities, so that the area code is also required for neighboring districts.

It is actually nonsense in a deregulated network to force competitors to simulate the local network limits of the ex-monopoly in their network. But the location-based nature of landline numbers is a sacred cow in Germany. It is better to spread the rumor that the Pope is evangelical than to doubt the meaning of this nostalgism.
Kleinbaumgarten dialing office
(Email address confirmed)

This text refers to the contribution from RagnarB from 13.03.2014!

In Austria, the so-called KEM-V 2009 is responsible for the design of public numbers. However, the provisions of the aforementioned legal body and the corresponding predecessor regulations only apply to newly assigned phone numbers.

In general - for conventional landline connections - (as a reminder: for new assignments) can be summarized:

Local network Vienna: one-digit area code (1), seven-digit normal connections.

Three-digit area codes and the local networks Baden, Dornbirn, Mödling, Wels (possibly one or two other local networks): six-digit normal connections

Four-digit dialing codes: five-digit normal connections.

Now there is a provision in this regulation that the phone numbers may (not have to!) Be shortened if:

the subscriber can establish at least 16 connections at the same time under this number, then by ONE position,

the subscriber can make at least 30 connections at the same time under this number, then by TWO digits.

The connection of a private branch exchange is not mandatory for the fact that one of these so-called SHORT CALL NUMBERS is then assigned, so if someone has 30 individual connections that are connected in series, he can request a short number with a number combination shortened by two digits.

It is important to know that in Austria you can apply for an extension number even with connection numbers of normal length and simple ISDN basic connections, whereby up to seven digits are passed on to the system (in contrast to Germany, the net extension number is used here, i.e. only the pure extension digit sequence that identifies the private branch exchange).

In incoming traffic, however, the functionality is only guaranteed to the extent that only up to 12 to 16 digits of the "nationally significant number" (depending on the provider) can be processed and taken into account.

In Austria, the first THREE digits of the phone number identify the operator who has authority over this number block. Depending on the length of the phone number, such a block comprises a whole hundred, a thousand or a ten-thousand, which the corresponding provider can assign. If a number block has already been "used up" to a certain extent, then the next block can be requested - the new allocation takes place arithmetically in ascending order.

As already mentioned, most of these regulations have only been in force since 1998, connections made before that have kept their original number length.

For example, in my home network Laa / Thaya (+43 2522 ...) there are:

(at least one) THREE-DIGIT phone number (e.g. 205)
Lots of FOUR-DIGIT numbers (e.g. 2211) and
Lots of newly assigned FIVE-DIGIT phone numbers (e.g. 20799).

In a neighboring local area network (Gnadendorf, +43 2525) there are still a considerable number of three-digit phone numbers, these were taken over from the analog switching time at that time into the digital successor environment without change, so if a "three-digit" subscriber waives his phone number there This entire block of numbers then falls back to the regulatory institution after a certain waiting time and is then available for re-allocation, in which case the relevant guidelines regarding re-allocation would then have to be observed.

Wolfgang Rapp
(Email address confirmed)

This text refers to the contribution by Rolf from 13.03.2014!


> 1. Why are today even in
> the smallest local networks
> six-digit participant numbers
> Standard?

Specification of the Federal Network Agency. Every provider has to adhere to this. It is not about the subscriber numbers, but the length of the total number. With us in the area code 07031, the phone numbers are now 7 digits, thus 12 digits with the area code. The old phone numbers are still 6 digits long.

Those who had 5-digit numbers got a number in front of them as early as the early 90s.

In the area code next door, which is 07159, there are still loads of 4-digit numbers. New, of course, no longer.

> 2. Is there a way
> despite the usual today
> Diversity of one
> shorter participant number
> to come?

Yes, but it's not that easy.

You have to look for an owner of an old short number (e.g. newspaper announcement) who would be willing to give up his connection for a certain amount X.

Then you can be registered as co-owner with the network operator of the connection and after about 1/2 to 1 year you can be registered as the sole owner (at Telekom there is a special form for which the former main owner must sign that the previous co-owner is now the main owner).

Now you can "move" with the connection to your main residence or - even easier - port it to VoIP and enter the access data in your router.

If you don't want to go via VoIP, it is best to do it with a Telekom standard (analog) tariff with a low MVLZ, which is the most flexible.

(Email address confirmed)

This text refers to the contribution from RagnarB from 13.03.2014!

I also have 2 phone numbers in Schleswig Holstein, Geschendorf 364 and 800 (it was Geschendorf No. 80 decades ago). The fax number was then assigned to us as 1451.

In theory, they are still switched on today and not canceled, but the house is currently no longer in use.

There was a numbering scheme, but I don't remember that. Only that including VAZ and ONKZ / phone number only 11 digits in total could be occupied. It was only with ISDN / SS No. 7 that it became 21, which, as it was passed through transparently, was also shamelessly used on my TK indictment with the number 313-X. So nothing with "1" digit DuWa on 8 digit system number.


(Email address confirmed)

This text refers to the contribution from RagnarB from 13.03.2014!

I'll hang on here with two questions:
Why are six-digit subscriber numbers standard today even in the smallest local area networks? Ok, thanks to digital switching technology, that doesn't cost the network operator anything extra, but isn't it much more practical for the subscriber to only have three or four positions, for example?
Is there a way to get a shorter participant number despite the multiple digits that are common today?

Thanks and greetings,
guest(Kleinbaumgarten Voting Office)
(Guest - data unconfirmed)

This text refers to the contribution from grobi from December 29th, 2010!

To rescue services (actually emergency services): they always had special phone numbers and special technical facilities. These were arranged behind group selector outputs at analogue times and were connected to these via direct current, because emergency services - purely due to the system - had to intercept every call and only then, when the identity of the caller was unequivocally established, the interception status was canceled.

Other comparable services normally had a corresponding number of connections, which were then combined to form a collective number (in Austria this is called "serial connection"). Due to the system, the number of such interconnectable connections was limited by the analog technology (rotary dial systems: normally 10 connections , but more with the technology of interlacing, motor selector systems: up to 100 connections - which would have made the line selector "ad absurdum"). With digital technology, these restrictions disappeared.

About the extension: The Austrian dialing system 48 (and its digital successors OES-D and OES-E) knew the extension beyond the usual line dialer, even in small and micro systems, larger companies then had several connections (possibly with extension ), very large customers were then given short numbers (shortened by two digits compared to the normal numbering plan, but at least two digits). In contrast to the German abbreviation number procedure with direct dialing, these short numbers were always directed from the preceding group dial level to the system's office transmission (i.e. purely incoming), the outgoing traffic was handled via normal individual connections that were interspersed in normal hundreds (these active numbers were passive not reachable and only carried their own phone number for billing purposes).
(Guest - data unconfirmed)

This text refers to the contribution by Thies Joachim Hoffmann from December 29th, 2010!

Yes, with the vanity, that may be true - at least in Germany and Austria, I think in the other countries, there was never anything like that anyway - they always had several individual numbers, like the multi-device connection today.

But today it is different, a system block is literally turned on if you want to have two ISDN basic connections.
Or even with one: You will be asked at the T-Punkt: "Why don't you use a system connection? For two euros more and many more functions" (what happened to me when I bought a Eumex 800 in my student apartment)
However, today it is anyway 'unpretentious #, these long numbers and the' cheap 'ten single-digit extensions. . .

what was it like in the past at rescue stations and control centers?
They had collective agreements, or what was that like?
Thies Joachim Hoffmann
(Email address confirmed)

This text refers to the contribution from grobi from December 28, 2010!

technically fewer than eight lines would have been possible, but the extension number with the base shortened by one digit for the two-digit block has practically occupied ten normal numbers and the technology was probably not wanted to set up in as large a number as there were business customers , but only for those where it made sense. surely smaller companies would also have liked to put on thick trousers with direct dialing, but the post office was not responsible for their vanity. so there were ikz connections only from at least eight. systems in the expansion 5/25 or later than 2w30 with six lines and thirty participants could also only use hkz. eight lines were also just right for the 2w80 (twelve lines): eight in extension and four hkz for outgoing traffic, that fit exactly. the basic fee for the connections was m.w. identical (hkz 27 marks, ikz 20 marks but without the twenty free units of 23 pfennigs each and the dial device for 2.40 DM), but there was also a "system fee" of two marks per extension (I guess to be actuarial, so to speak to compensate for potentially higher interference suppression efforts, but maybe just out of sheer pleasure in fooling around). a royal Prussian (or Bavarian) direct vote permission was probably not required. to be able to afford the basic fees for eight lines in addition to the system was probably sufficient screening criterion that not every hanswurst wanted something like that too. when isdn came, this unreported number of would-be direct dialing owners then lit up quite quickly.
(Guest - data unconfirmed)

This text refers to the contribution by Thies Joachim Hoffmann from December 24th, 2010!

Yes, that's right !

the 'collective numbers' of our business customers were indeed the 30s (30XX) and 20s (20XX).

I thought about it, at least that's the case with numbers I know. So the third from last digit have a 0.

The IKZ connections also belong to the same blocks, for example 571-x to 579-X. (or 61-x to 69-x)

What was it like earlier with the IKZ connections, which criteria had to be met in order to get one?

I think you had to book at least 8 lines.
How were the fees?
Thies Joachim Hoffmann
(Email address confirmed)

This text refers to the contribution from grobi from December 23, 2010!

for the individual case i would have to be a fortune teller to be able to name the respective reason. basically it was like this:

for business customers with more than two lines, it made sense to give them collective numbers. If one line was busy, the caller was passed on to the next until a free one was found. to do this, the connections involved had to be interconnected accordingly. as they did not want to prepare all the racks "on suspicion" for it, only a few "groups of hundreds" were set up for this purpose, and their numbers were then assigned to this customer group. Often - but not necessarily - it is a question of groups of hundreds whose phone numbers had a "0" in the third to last digit. With the digitization of the exchanges, it then became insignificant whether the following numbers were free according to the desired number of lines.

for a similar reason (lines ikz instead of hkz which cannot be dialed) the dial-in connections used to be in certain number ranges.

Numbers that begin with "1" are almost always assigned at times when the numbers are scarce and typically the preceding one (but not the preceding one, as it is usually not a connection with formerly shorter numbers) "1" is longer than the older ones same switch-on area.

One has never changed phone numbers as far as possible. A typical reason for an exception to this was when a new residential area made it necessary to divide up a switch-on area. Then the remaining part was usually left with its old numbers and the connections that had been switched to the new switch-on area were renumbered. In doing so, efforts were made to find a workable compromise between a not too "thin" allocation of each hundred and an extensive retention of the numbers. most of the time, the last three digits remained the old ones.

If there was no initial digit (since a single or multi-digit "digit" at the beginning could only be added to one switch-on area) for this possibility, the capacities had to be branched off from the existing switch-on area. this was typically done by "drilling out" the numbering capacities, on an asb 2 with rn 21xxx to 29xxx new connections 20yxxx were added.

Connections via auxiliary constructs were switched back to regular connections as quickly as possible when capacities became available or increased.

Prefixing digits in front of whole number ranges was usually only carried out when there was a shortage of numbers.
guest(Kleinbaumgarten Voting Office)
(Guest - data unconfirmed)

This text refers to the contribution from grobi from December 23, 2010!

The grouping of business customers in certain number hundreds was that such customers usually had or have several connections.

In order to be able to make sufficient provision for their telephone accessibility, separate series hundreds were created (in Germany this will probably have been called "collecting hundreds").

While it was possible to get by with an average of 10-13 line selectors per 100 subscribers for normal telephone number hundreds, the series hundreds were designed in such a way that, for example, 40 or more line selectors were available for these telephone number hundreds.

In Vienna, there were up to 80 line voters per 200 participants in some offices, but this was due to the system's 48M motor selector system, where each line voter could serve two hundred. And still there was lost traffic at peak times ...
(Guest - data unconfirmed)


Thank you for your answers.

I also meant, for example, whether certain hundreds were reserved for certain customers.

In a local network, for example, 4-digit numbers with 30XX have belonged to almost all business participants, i.e. schools, banks and companies. Often these then had several numbers, e.g. 02407 3015, 3016, 3017 or 3021, 3022, 3023 etc.

Private customers often had numbers with 17XXX, five digits.

In the local network 02405, which was already 'broken' in the 80s, the numbers were often extended, changed, etc.

Around the end of the 70s to the middle of the 80s there were 6-digit numbers 2xxxxx, which started with 2, which then disappeared again. Until 1999 there were no more 6-digit numbers, only 5-digit ones, which were previously partly 4-digit (an 8 was introduced)

What was the reason in each case?
guest(Kleinbaumgarten Voting Office)
(Guest - data unconfirmed)

This text refers to the contribution from JH from December 11th, 2010!

But please, this is a quarrel about the emperor's beard.

The fact is that a rotary dial that was common at the time - with a few exceptions - gave just ONE pulse for the digit ONE (and still does it today) and for the ZERO TEN pulses.

It is also a fact that when switching from the manually operated system to the automatic procedure, a simple and logically comprehensible conversion was made by adding (for example) three-digit addresses to the old manual switching numbers by adding a TWO in front of the two-digit numbers, So from "11" made "211". With single-digit numbers, "1" became the new number "201". And all other connections were converted using the same procedure. The new connections were then arithmetically linked to the number block that was already connected.

And this probably explains why the numbers ending in ... 00 were often not assigned at first, precisely because there was no corresponding predecessor with "0" from the manual switching time.

In this country, by the way, the number of the first hundred ending in "00" was often used as the "secret registration number" for the local remote office, so that the local post office could register its calls with preference over the others at the remote office.
(Guest - data unconfirmed)

This text refers to the contribution by Thies Joachim Hoffmann from December 11th, 2010!

You are drilling your way here on the representation of the number according to the mechanical principle of fixed.

The drawing was drawn from a part of the specialist book Dipl. Ing. Krause Ortsvermittlungstechnik and also from older publications.
Here, too, the spelling was given as in the drawing. Other parts are drawn from an even older book, here too the spelling is given as in the drawing.

The last hundred with the 0 is also marked at the bottom according to the mechanical sequence of the lever dial.

The number range as an example is from 200 - 299,
this spelling is also given in several specialist books, or the spelling is specified with dots 200 ... 299

Should I write in your opinion the number range is from 211 to 200.
or 211 ... 200. Is the arrangement of the voter technology so correct. But for the majority of readers, the spelling 211 ... 200 will be completely incomprehensible.

There were also countries where the first step was marked with 0, then it should read 200 ... 299 again, then the drawing would be correct again.

From my point of view, it is the subscriber number in the example from 200 - 299, and only this type of writing should be the most intelligible.

It was about the question of the cause of the different long numbers. This question should be answered.

Best regards
JH (author of the article with the drawing)
guest(Kleinbaumgarten Voting Office)
(Guest - data unconfirmed)


In principle, the number structure thing is quite simple. However, one must take into account that with the electromechanical switching devices, such as those from 1908 (Hildesheim) to the last years of the analog telephone (in Austria up to December 24th, 1999), each digit to be processed requires a technical effort and this is already purely economic Wants to keep reasons small.

Since - for other reasons - one (at least) group dial level and exactly one line selection level is always required to establish a connection, the result is usually a three-digit number if one assumes that each group dial level is a digit of the phone number and the line selection level (usually) records and processes the last two digits of the phone number (we leave out the exceptions, at least in the first consideration) once and for now.

If we take into account that the height step "1" of the first group selector is intended for the emergency carriers, the height step "0" for the initiation of long-distance traffic, there are normally 8 usable decades, i.e. 2 ... 9 left for addressing local traffic.

Normally, when switching from manual to automatic operation, it was ascertained how many participants are currently waiting for the switch and, if applicable, how many are to be expected as new connections in the near future.

These considerations mostly resulted in the variant, especially in smaller local networks, that one started with three-digit phone numbers, i.e. with 211, 212, ... and then connected in ascending order.

At some point you discovered in the course of expansions that you couldn't get by with the address range of the 8 hundreds and then took a free decade, often one of the last free ones, i.e. 7 ... or 8 ... plus the four-digit phone numbers there to be arranged by just arranging a second level of group voting between the first group dialer and the line voters of the new thousand.

The existing three-digit numbers were mostly left unchanged.

The same procedure was followed if this block of thousands was also used up, and there was often another usable thousand.

This principle is based on all local networks that only consist of one (!) Switching center. In larger local networks with several exchanges, a so-called "hidden code number system" is used, which in principle does not mean anything else, that you also dial the code number of your own (!) Office when you want to dial a connection in your own exchange area.

A concrete example in the Viennese local network: The Favoriten switching center once accommodated all Viennese call numbers in the number range "64" (and, for the sake of completeness, also those in the number range "62"). It was therefore necessary, when using the above-mentioned "hidden code system" of all (!) Connections of the Vienna local network, to dial the digits "64" before the actual number of the subscriber connected to the Favoritner office, regardless of whether the caller himself was in Favorite sat or at the other end of town. Calls remaining in one's own office were made using dialing levels that in principle would have been dispensable, but this effort was still made in order to have uniform phone numbers within a homogeneous local network and to keep the subscriber in their own location regardless of the switching structure.

In the course of time, larger local networks were converted to (almost) uniform phone number lengths, the older connections often had a phone number that was shortened by one digit compared to the call stations set up later.

With the systems used today, there is no real additional expense in terms of the length of the phone number, and phone numbers can currently be taken to the new location (within the same local area network) regardless of the exchange to which the connection is brought Problem to operate phone numbers of different lengths mixed in one and the same local network (some systems abroad do not have this serious advantage ...)

P.S .: In Austria the numbers ending in ... 99 or ... 90 were often used as test and substitute switch numbers, so these were relatively seldom found as subscriber numbers at the time. Numbers with ... 00 were usually given to VIPs, where absolutely no false calls from stuck voters were wanted.
(Guest - data unconfirmed)

This text refers to the contribution by Thies Joachim Hoffmann from December 9th, 2010!

It is true that these numbers were normally not assigned. Maybe the clocks tick a little differently in our area.

In this example it was only about the general number assignment and length. There have been many exceptions. You can also write a whole book about it.

I picked out two numbers that have been around for ages in our area. The last 00 were also awarded there. The numbers still exist today.

(0 99 71) 5000
(0 99 71) 3000

Best regards
(Guest - data unconfirmed)


Let's start from the top with long-distance dialing technology.

Example at a number 09973-8404

0 = traffic elimination for long distance calls
9 = central area Nuremberg
99 = main exchange Deggendorf
997 = Node exchange Cham
9973 = Furth im Wald local office

Now the first 5 numbers are gone.

For a local office with 3 numbers, you can connect 800 to 900 participants. The 0 cannot be used for long-distance dialing due to traffic restrictions.

For a local office with 6 numbers you can connect 800,000 - 9,000,000 subscribers.

At that time, the area code and the participant number could not be longer than 10 digits.
For this reason, shorter area codes were assigned for the larger towns. z. B. 0811 for Munich.

As soon as the local network in Munich required more than 800,000 subscribers, it had to be expanded from 6 positions to 7 positions. The area code was then shortened from 0811 to 089.

Let's come back to the smaller village with 3-digit numbers. These were usually distributed like this. Example.
First assign all numbers from 200 to 299
Then 300 to 399 etc.

If it was foreseeable that it would soon no longer be sufficient, then the last free group of hundreds was assigned 4 digits long numbers. So from 8000 to 8999

If possible, all number ranges that start with 1 should not be assigned to participants. Because these numbers were reserved for special services (fire brigade, police, information), etc. But even this number range with 1 was occasionally used in some local networks as the last emergency solution. But then later changed again.

At that time, the number allocation was always coordinated with the corresponding elective levels. Nothing could be changed electronically on the number.

Town with 3 digits Numbers have the 1st group dial level (1st number) and a line dial level (2 and 3 numbers). If more numbers are required, a 2nd group dial level has been added to a free first number (example 8). There were then numbers in this local network 3 and 4 digits long.

If a larger local network consists of several exchanges, then these variants apply separately to each exchange.

The length of the call numbers is limited in the call number memories. In the case of long-distance dialing, the number had to be temporarily stored until the decision about the route was made. At that time there was only mechanical storage, the storage volume was limited. The telephone system in the USA could only process 10 digits, so the numbers could not be longer than 10 digits.

Best regards JH


(Email address confirmed)


Sometimes it also depended on the planner as to how the phone numbers were expanded.
Each planner had his own signature. Some stuck to the guidelines
others don't.
Companies normally came in a hundred for hunt group numbers that were short.
It also played a role whether the local network had several VSt'n.

Greetings Klaus